title: Photochromic polyurethanes for rewritable CGHs in optical testing.
abstract: The development of photochromic Computer Generated Holograms (CGHs) to test any complex optics, such as aspheres and free-form optics, is described. A thermally irreversible photochromic polyurethane has been synthesized to give good thin films with a strong modulation of the optical transmission. The photochromic CGH has been tested with a simple interferometrical configuration showing promising results. The use of photochromic CGHs provides advantages over standard technologies, as rewritability and self developing.
authors.affiliation: Dipartimento di Chimica, Materiali e Ingegneria Chimica G. Natta, piazza Leonardo da Vinci 32, Milano, Italy. giorgio.pariani@brera.inaf.it
authors.forename: Giorgio
authors.initials: G
authors.lastname: Pariani
authors.forename: Chiara
authors.initials: C
authors.lastname: Bertarelli
authors.forename: Giovanni
authors.initials: G
authors.lastname: Dassa
authors.forename: Andrea
authors.initials: A
authors.lastname: Bianco
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Zerbi
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D006696:Holography / Q000295:instrumentation*; D016247:Information Storage and Retrieval / Q000379:methods*; D008422:Materials Testing; D011140:Polyurethanes / Q000737:chemistry*
chemical_list: D011140:Polyurethanes